单项选择题

When the mongooses in Jamaica killed off the rats they ______.

A．attacked the humans
B．ate the sugar crop
C．became problems themselves
D．had nothing to eat
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单项选择题
When predators control fails, nature brings animals population into balance by ______.
A．eliminating the number of predators
B．increasing the number of other animals
C．seeking the help of disease to reduce other animals
D．replacing the number of predators immediately
单项选择题
According to the passage; through which of the following is the energy released in the Sun pass before it becomes light
A．Electromagnetic space.
B．The solar surface.
C．The X-ray part of the spectrum.
D．Interplanetary space.
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